The Labor Force Survey is based on a multi-stage stratified probability sample design. The size of the quarterly sample is approximately 32 thousand respondent households (about 65 thousand persons). The survey is continuous and consists of three statistically independent monthly sub-samples. The basis of grossing up is the population number in the survey period estimated with the help of a mathematical model. The population number in each population group is calculated by multiplying the sample values of the different strata with the proper weight and summing them up.

Based on data about the economic activity of population aged 15–74 years living in private households.